Re: [Enigma-devel] Call a function with current x/y coordinates

[Petr Machata]

Michi Hostettler wrote:
> hi,
>
> is it possible to get the current x and y coordinates for a cell? for
> example:
>
> Require("levels/ant.lua")
> function file_oxyd(x,y,f)
>     oxyd_default_flavor=f
>     oxyd(x,y)
> end
>
> function GTarget(x,y) <--x and y should be the cordinates of the cell
> print("gt:",tostring(x))
> print("gt:",tostring(y))
> if (x==1) and (y==0) then retval="laser1" <-- Only if current cell is the
> cell with the red marked !
> return (retval)
> end
>
> function GAction(x,y) <--x and y should be the cordinates of the cell
> print("ga:",tostring(x))
> print("ga:",tostring(y))
> if (x==1) and (y==0) then retval="laser1" <-- Only if current cell is the
> cell with the red marked !
> return (retval)
> end
>
> cells["!"]=cell{stone={"st-switch", {action=GAction,target=GTarget}}} <-- if
> a cell is ! then it should call GAction and GTarget with this cell's
> coordinates.
> cells["."]=cell{stone={"st-laser-w", {on=1,name="laser1"}}}

As to my best knowledge, action and target have to be strings. Enigma 
then takes an object with the name <target> and sends a message <action> 
to it. No coordinates are transferred.

If you want to call a 'GTarget' each time you press a button, use this:
 action="callback"
 target="GTarget"
However, GTarget will get only one argument -- a state of button (1 or 
0, afaik).

You could somehow utilize CELL's parent handling, for example this:
 cells["!"]=cell{parent={GTarget}}
will call function GTarget for each cell, that you marked with '!', and 
it will pass a coordinates also. But it will be done once only, at the 
moment when you call 'create_world_by_map'.

Actually, there is at least one way how to make what you want. But it 
involves rather hardcore LUA hacking and definitely it won't be nice code.

> michi

Petr Machata